init: 汇率换算工具小程序骨架

- 两个页面：首页（双向换算）+ 汇率总览（一对多）
- 基础项目结构和配置
- AppID 待填入

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

miniprogram/pages/index/index.js

@@ -0,0 +1,7 @@
+Page({
+  data: {},
+
+  onLoad() {
+    console.log('Index page loaded');
+  },
+});

miniprogram/pages/index/index.json

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+{
+  "usingComponents": {}
+}

miniprogram/pages/index/index.wxml

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+<view class="container">
+  <view class="page-title">汇率换算</view>
+  <view class="page-subtitle">实时汇率，主流货币换算</view>
+
+  <view class="card">
+    <view class="placeholder-text">功能开发中</view>
+  </view>
+</view>

miniprogram/pages/index/index.wxss

@@ -0,0 +1,6 @@
+.placeholder-text {
+  color: #999999;
+  font-size: 28rpx;
+  text-align: center;
+  padding: 48rpx 0;
+}

miniprogram/pages/overview/overview.js

@@ -0,0 +1,7 @@
+Page({
+  data: {},
+
+  onLoad() {
+    console.log('Overview page loaded');
+  },
+});

miniprogram/pages/overview/overview.json

@@ -0,0 +1,4 @@
+{
+  "navigationBarTitleText": "汇率总览",
+  "usingComponents": {}
+}

miniprogram/pages/overview/overview.wxml

@@ -0,0 +1,8 @@
+<view class="container">
+  <view class="page-title">汇率总览</view>
+  <view class="page-subtitle">一个基准货币对所有主流货币</view>
+
+  <view class="card">
+    <view class="placeholder-text">功能开发中</view>
+  </view>
+</view>

miniprogram/pages/overview/overview.wxss

@@ -0,0 +1,6 @@
+.placeholder-text {
+  color: #999999;
+  font-size: 28rpx;
+  text-align: center;
+  padding: 48rpx 0;
+}